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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e4a5083d898205be5f00bfaf61ceba2b4b61c2ebfd9c4a68c4888c9834b4daf' 
  AND token = 'b1Biq3ovb1KkkNOFL1aMV1EiaHNxKrX25tywDCq5XNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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