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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb883e4599a1d80936168c11cfb5b77748146419a267fde268783ba2c0103ca4' 
  AND token = 'Fp+aiTgzHrda+2Vie2Rs94DMWlNZ+Ihrs0d3FjY9M6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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