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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac09379fce59dfb5b8b1fef8b0aebc7b2d06961782811a492941f944980667bf' 
  AND token = 'G3LisUM15oRInMnYG2JkwujXsu5Rv5Qv0vuTvk+Bd04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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