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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '062ad374498d35d9dc673b9faca4a86f87bc8eac1ec790aaa56f9c714862e59f' 
  AND token = 'uex6h88hHJm/PyekE+dKlc/Wp/o20AX9S8wHKg6JqxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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