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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd193480d350c6555e0d1d7f5aa114fa68976e23bfa03bc043313048a6218f092' 
  AND token = 'Rdv85kMPRkRi6pXe7ZnmSAftujaDkdiryWlOk1yQoVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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