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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aee7741f2cc1dc2a553a7322cb4b506f424a1d34c158648ed22f1d83dea4f9b' 
  AND token = 'BwbOJpZ+S1llb0thEo0sqd912LpxL7H97KLW3C/+w0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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