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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c857208d4c8fd59dd38efac3fa32a842d1e54408a940f8665d5c7b1c54479ca7' 
  AND token = 's2sOXPFygyfFa9veJzG3x83JsdU/OcWEzTU2D2zkFbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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