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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab2358b0ef066940b64feedda3c396e91c55eacb48193434903f2077afb8250' 
  AND token = 'K7xbUK0Wq9YCdv0zPPDIAU0xWkKTOPNSVAEuJdyxUy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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