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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb833858eca94cf5c07b128fe80e53cf1f041e51ab2ce2bd227ee60e65128b3' 
  AND token = 'cuaTkazHnGtiWtLSndEe5OL8WmWUL00PQ8cj/B/9GIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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