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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8fd92f562e13b0a384e51e67fb805155c493683fbf0fc077422ed3c0e295bd3' 
  AND token = 'guSXDnt1bycQfGrHRXH+6jZQhCIad4k/KXtb+9sYEqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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