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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989940839b3c09a71d2602f083fbbfe01b06d0fb2b5c0245cd94a84cc578f63d' 
  AND token = 'bbVP/r0EK7vS4NuOpNYmGO79Ke8jOH26ktRta0eQ+s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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