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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa964f6187db0e3b9bd21324b24566f8e215282e49fc0e99c02e609ee372358' 
  AND token = '4FLxeaAlK3148oF37pjmZcCu88tsxjF+EH4ofj0K/b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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