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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '515a1d729d1bdc24ba4ce8bc871fbc1b7cf3749231ba8a1a6d6047ab17ccf867' 
  AND token = 'iydvK2tmPJFMMCYq+ra9fIn+FxM+Iqfr6z24Pvj6DTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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