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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01bcca7f8a23b211cead94218bb43941cb57ed85335ed7d7bcb48aadb7b26d6' 
  AND token = '9dP938cZa1waSiphjjMGtGCwpsJnVR6Qbxwc76dtEcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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