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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be45a1e3b9006d68f1ddd6e19fdd6a0b55de2ebb87065aebb39a91e1ebc43edb' 
  AND token = 'QdV+zJhgB8DCkv9kopr3E2h/x5OjsnwPxNDYHA55Uro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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