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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d937f2d33695808cdbe1b02ea367e2c63dc7011c50cb96c15ffbcb723f2a660' 
  AND token = 'v1gUx9UcYNsHI/l22WNLweymZ3PrMIFB8HmYf9rmCUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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