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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55cbf933b8cdb6ebbb04141a5616d3488fb8c092350f1a27bfa0957f77dd38f9' 
  AND token = 'cFKNDZsxz9iCInPFM3RjTjP0xTKkAwuknldM3G8CPCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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