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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49891f0b58fa036bfbbbc0815f44b9898f096d292c095da610c23afa55f5ad9c' 
  AND token = 'Jgbg2k74ujGt7IhHbedPWyCllFsHbttXKWkub81oKsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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