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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74cb1d0f95017186766f9f5ab49918fcc7a64426ca72a77024738f0a475e85af' 
  AND token = 'Rrb+SOirdKwq58UA6LnDPfQ3fEGwsrEZWpi3TAR8wCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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