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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98571ce6b66c1f7fbadb1a7fec44138b1d69e10fc8cb30535634e224c53b79b1' 
  AND token = 'M94K+lzfujagFthtZR3iToF+0rmxitYQ5bHsNr8pPYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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