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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8693341922310412ab2b23577352b7a6a4cc51d592af78395277e76a75c2f61' 
  AND token = 'd/fcs8Sds/J84IcK29r8XHJgS8gC63dUHQIxYcQI/Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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