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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c5c4b6cae1f55c9d3c93a2818829294cd43e7b2c87b8938a230958cd478292e' 
  AND token = '8rsiSMXfUYUtvN+vVKgmpmxfgKG9w3a5QJueAU2j9vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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