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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e1e08999a63adcb76a1d5e81acd1530c080d8198b2f9b2a868aa9cf4815eab' 
  AND token = '4zSGfTRlM4UBHvYZ+Cb7woMRYvLq3qkGzKZeo41YJ90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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