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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c95287dd7ce2c85789fba4bd5ec5b0520e3a3fc4fa97b1af3996aae5ab050b67' 
  AND token = 'DkgBd3tTR90/kT1pYr3SHgCiWCDMVKuREvjjcIeq6MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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