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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c58edc52ab898a03e1e6912ef805fcdde872d83238ab95719853b87d1499ed' 
  AND token = 'LLe0OOXtSJHt6lPTBBne9rU5hziuWO+YoS3SG5PPXSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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