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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c39d90e9fabaa8259cdadf0d00473ff7dbd8b6c7c92c0369f4c83bc697132e' 
  AND token = '7xyT1dq3D8ta/Wi3TECZ2cm0F1cxzP53R9jhPGFW3jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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