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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30b6b8d7e07b1f60809ef56a890a8788ca6b7b0f9212ccfc55ef3a51347ed26' 
  AND token = 'AwS8cqcZkJRNP2Ct5ArIkkOPj+DIOBqaDrJa7yzAS4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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