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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22da14a607ff701531f36f0807cb0c234505135526529523fa9f353397bfe4dd' 
  AND token = 'vhozeeE/VRvzC4itpzEQ19pZqn8VfNiq51pXfWYAdVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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