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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b316ce84d7ab93227fccbe75d8d9fa4c94eec3f65c98d47eacc7365de86cde5' 
  AND token = 'w3U9gGdQpPdieY/4E3OTCGSuduRaBc33L0ShtVJUJbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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