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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '823b3e6b15a6e7ed661673fb883767bc8bd197cf85f6353be6a1f58aa850d81c' 
  AND token = 'up7/hO7uO+6ScTTuAFtTThksuCA0MRZ8i7mWn4WO+iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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