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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48a0be3a6484f3f06bf30a1bd810f5a9d38548a363e6f8970c535b0f74f335ca' 
  AND token = '7fZAYcf7dWSIrbmOqtumPtLAeCMgc4baec9DUnli0n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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