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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e61066b0839c561a6d5684918d2d1fde26ebccd10e933375b87498d8163d92' 
  AND token = 'pA3Hsngf7YmkDreJnWKVp2RlnocjwbNwkI68LINntsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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