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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e8ee2d4e3a3b68becd65013fe8fb5a66bb67666f89898b8c5d586ae422d69a' 
  AND token = 'nv0WvLcDXCaklW1E0HH06DWPytV8uXpKapZn93LemSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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