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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e365f31a271579243916f8d6078d21637ed37e754004d1af855756f46647f5d' 
  AND token = 'dfYnZlfheP9qa2iiHGuQjdhERkN1SfkL4o+SV10NX2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}