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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d3dcf78aef7eea198950d5d2f6dbdd1b56b3473f6d2a930dfc56420c1ec61a' 
  AND token = '2UFqILLipFgr77yq7A7CRg2KTySai/KqDTuzhcfzAgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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