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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8233d98786ac9d9718ab2504a41cf84a349d1019693da13b2e72898567b64f5f' 
  AND token = 'npYsFqCn1UEarCjQCHhPcU87ct90q9fbSm9hEAi7PVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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