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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a5c7d2329aca1ae5196f5c6495c2174f1f151c09ec2925d38dc8810bcb1c892' 
  AND token = 'TW+tjzbnWwFA5fAii7623MpRR2YxlKOM6RuaGWaBmRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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