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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f110d8347c08f88550097f4cdcd9d37494b00e69dd57d932fd01fd68a7ee05fe' 
  AND token = '5qZGedzM4buePK1fRsc2Pq9TR6hrXf6hqSNJl297X0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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