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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d5a7e634c5fa25b11f057bb6ab657a4930a186e3b70fcb9db7d13e3970ceb6e' 
  AND token = 'Q+4u91CzxSMZUQ4XIsOoy5J0GRBoCJyBC3i6NBdDX9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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