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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe995acd6c196e7f3f3981d3a0dc1d0349df7eb53e23090c379f09dc677ba22b' 
  AND token = 'DZ5K6kssC8zJ9gVJw1WKDoyyke0UthA6pOMSHAStxOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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