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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '596df964809bcf65951e7cba3fc7344643c551b70bae68d6190ccfad3a193c8b' 
  AND token = 'f+CHjNMHWV01gAWEuuapCZ6Ne0CxX7a2wCHkn6sp4DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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