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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad086716ff27870b8620e8747cdb1448bb39c88a8394a285e6bf05817f18c87' 
  AND token = '1n4ZIxqT1l5mx0x9MYXJytCmDNpj1JbA/ArzgWda09E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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