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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be2969a26e21ee8c504d5609ad852ec87b48c242cf255852e04daa7cfe9d74f0' 
  AND token = 'cteCL55t7odSAjjrP8k+jq7rEow2Mwp8orSvaG2DqJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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