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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ba3122f68417edffa5b8dcdfa03fe4b7025a686ff6d86b79eff9344c08493e' 
  AND token = '1MyWDbXm4P3JpA+GfJVhSCcwdmmUmihXkGDEIgS7rYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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