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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e0d9ce0e995f7dc617275193ef5e47bf82c738aa5ef405f8120204fba55bb35' 
  AND token = 'Ym+SV+RsmkF23bekV9r9MdeHnbvMMPWPeWAL5VXXZ5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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