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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f29067b6662525a8b050d1b558959ae050819fb43395a2db38825c014c49f7d5' 
  AND token = 'TDLCFRUReekdMG89WGuh1F8ctSzUGpzjF7ZJbu/SCm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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