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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e7b5a7908ddf3aa9b3da211f9efb02c9ef8073d695ac03890a1f654e471b54' 
  AND token = 'SW3cfRTm7BBcVzGzQdipP2kffP2MaI4YGFj6rCNroRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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