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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10d330ef4e520a4f0e94e1ba3a0f7c1654e83de03e9654ef66f97e2f8249595c' 
  AND token = '7bNv62QV+4Htlvryc1VEs+QQj4ATN2jMidFDHZNPgDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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