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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1b9f92c0784c5d3b401fb88033bd339ffe97cc0bdfe34dba96ca477afa9e932' 
  AND token = 'CR2UDZrER7j71zeDCSiu9LVdX5THAGpiPUDA7d4eXEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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