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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30969a509db791d31721835156bd50c58ad7f2876e8473ffa7343d7807d31a0e' 
  AND token = 'hXgw1uhRoFP/ZcKA/rVasqllye7328x8IVJFb9W1AFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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