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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9786423567ab34e65a5a7b1891fb3402bc30ac92d8477a3f380b1f42b834771b' 
  AND token = 'BV4eVt1Le1Op2JRYcYea1pdjIYF+rFNZ6JQHMdIGFxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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