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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cfc25767f946ca4c9d74e9127dceae3e44c98a367a7435809816dd7e45079aa' 
  AND token = '93yDRz8RJORctHlo73/eBGAyc9P7wFNhyATIMjzmPQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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