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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b8e0c27bef7c441c9b30338e6a79df2e9f64656ad431b681c800c716ba9197' 
  AND token = 'bOA9akitYczs3X+1UB5imVnc8r3aq54k1ZtVYaGjfro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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