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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87e1d6788c6c62a57d3dd8773eca93463b597f38a342f4e029d73b42d530963' 
  AND token = 'v9+7mC2sUYzDPMliAJfRJG1RYQeulX8i3GYb+DN1zuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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