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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '337491ff61f5b1455381de6a6361fd6b20711408fb7fb90fb26d71563cad4b70' 
  AND token = 'OXq8mzgNulFNXtOCiSPt5W18KMo2k8ZCcCRB1+ekCgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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