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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc747b4afb453d4284d14af3f7cca61755733ec169288fe585bad96ddcb114cb' 
  AND token = 'EOfumxk1s1wdFFq6aJvCHg7TNYHEOTY55lc7nkO0u3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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