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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c552472417192f42388365491dc8d39c04a9d580f9ad31bc4543b581a8d99848' 
  AND token = 'WKbNFEySkeI103+lIW65zBp2vnmr4T9H09dHCkJJqAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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