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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '063aac3cc35b05601920cc64e5c956fafa523d150f304088e3a23a2819c7264e' 
  AND token = '2lklJn1VdObn5S8x4feFra9UC8HRhSjofA+EK+t97E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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