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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ed6e50eaa8dd441ea357e811174edf5caf1dc202d61de5485bc65d3b178623' 
  AND token = 'folGga3wNFBp4rrOwF+BSVXpE6WyVOXID/5qbQjR6rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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