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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20dd9c67d1a1f41cefdc54d0419b8892c31122901c88f635cc85a8fe8f8f56d6' 
  AND token = 'MeQevd9Q3samfrRZ0JTba50uGf+hnXT7SqyQx2MRcYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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